Problems with eBay's Global Shipping Program?

[ATP]

I use the program but have been torn regarding opting out once. Pitney opened my package that I carefully packed, removed the bubble wrap, and repackaged it. When it arrived to canada, it was a framed autograph, the glass was broken of course. The buyer thought I had packed it that way, and was furious after what they had paid in shipping. On the other hand,I have had a couple things lost in foreign countries at customs (or the buyer was untruthful) and it does remove some of that stress and dealing with any special customs forms.

Something I have been meaning to ask and Is somewhat relevant in this thread. Can someone from canada or another country confirm whether or not some of the charges that are paid for shipping in the GSP program include the custom import taxes based on the selling price, or do those still have to be paid separately?